The flower of justice is peace is a prayer recited by members of the Radch military upon waking and while making morning offerings. The prayer is based on the concepts of Justice, Propriety and Benefit.
The words to the prayer are as follows:
The flower of justice is peace. The flower of propriety is beauty in thought and action. The flower of benefit is Amaat whole and entire. I am the sword of justice properly wielded, wet with the blood of the wicked. My armor is righteousness and my weapon is truth.
There are additional verses, but they have never been published in full. The published novels only contain the text through "I am the sword of justice"; the rest only appears in a snippet of Isendeni Station (Ann Leckie's original, unpublished Radch novel) which was posted on her blog.